Japanese Finance Minister Taro Aso said on Tuesday that the government is still trying to figure out what has led to the collapse of the Tokyo-based bitcoin exchange Mt. Gox and is not sure whether crime is involved. “(We) don't know if it was a crime or just a bankruptcy.” Mt. Gox, once the world's biggest bitcoin exchange, filed for bankruptcy protection in Japan on Friday, saying it may have lost nearly half a billion dollars worth of the virtual currency due to hacking into its faulty computer system.